MARKET RISK BENEFITS - Reconciles Market Risk Benefits (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023
Market Risk Benefit [Line Items]
MRB Asset	$ (34)	$ (24)	$ (22)	$ (24)	$ (15)
MRB Liability	6,383	7,333	$ 6,712	$ 7,367	$ 16
Individual Retirement
Market Risk Benefit [Line Items]
MRB Asset	(34)	(24)
MRB Liability	6,383	7,333
Net MRB	6,349	7,309
Purchased MRB	(7)	(9)
Net amount at risk	6,342	7,300
Individual Retirement | GMxB Core
Market Risk Benefit [Line Items]
MRB Asset	(25)	(14)
MRB Liability	912	1,205
Net MRB	887	1,191
Purchased MRB	0	0
Net amount at risk	887	1,191
Individual Retirement | GMxB Legacy
Market Risk Benefit [Line Items]
MRB Asset	0	0
MRB Liability	5,450	6,082
Net MRB	5,450	6,082
Purchased MRB	0	0
Net amount at risk	5,450	6,082
Individual Retirement | Other
Market Risk Benefit [Line Items]
MRB Asset	(9)	(10)
MRB Liability	21	46
Net MRB	12	36
Purchased MRB	(7)	(9)
Net amount at risk	$ 5	$ 27